/**
 *    Copyright ${license.git.copyrightYears} the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.mybatis.generator.config;

import static org.mybatis.generator.internal.util.StringUtility.stringHasValue;
import static org.mybatis.generator.internal.util.messages.Messages.getString;

import java.util.ArrayList;
import java.util.List;

import org.mybatis.generator.api.dom.xml.Attribute;
import org.mybatis.generator.api.dom.xml.Document;
import org.mybatis.generator.api.dom.xml.XmlElement;
import org.mybatis.generator.codegen.XmlConstants;
import org.mybatis.generator.exception.InvalidConfigurationException;

/**
 * The Class Configuration.
 *
 * @author Jeff Butler
 */
public class Configuration {

  /** The contexts. */
  private List<Context> contexts;

  /** The class path entries. */
  private List<String> classPathEntries;

  /**
   * Instantiates a new configuration.
   */
  public Configuration() {
    super();
    contexts = new ArrayList<Context>();
    classPathEntries = new ArrayList<String>();
  }

  /**
   * Adds the classpath entry.
   *
   * @param entry
   *          the entry
   */
  public void addClasspathEntry(String entry) {
    classPathEntries.add(entry);
  }

  /**
   * Gets the class path entries.
   *
   * @return Returns the classPathEntries.
   */
  public List<String> getClassPathEntries() {
    return classPathEntries;
  }

  /**
   * This method does a simple validate, it makes sure that all required fields have been filled in and that all
   * implementation classes exist and are of the proper type. It does not do any more complex operations such as:
   * validating that database tables exist or validating that named columns exist
   *
   * @throws InvalidConfigurationException
   *           the invalid configuration exception
   */
  public void validate() throws InvalidConfigurationException {
    List<String> errors = new ArrayList<String>();

    for (String classPathEntry : classPathEntries) {
      if (!stringHasValue(classPathEntry)) {
        errors.add(getString("ValidationError.19")); //$NON-NLS-1$
        // only need to state this error once
        break;
      }
    }

    if (contexts.size() == 0) {
      errors.add(getString("ValidationError.11")); //$NON-NLS-1$
    } else {
      for (Context context : contexts) {
        context.validate(errors);
      }
    }

    if (errors.size() > 0) {
      throw new InvalidConfigurationException(errors);
    }
  }

  /**
   * Gets the contexts.
   *
   * @return the contexts
   */
  public List<Context> getContexts() {
    return contexts;
  }

  /**
   * Adds the context.
   *
   * @param context
   *          the context
   */
  public void addContext(Context context) {
    contexts.add(context);
  }

  /**
   * Gets the context.
   *
   * @param id
   *          the id
   * @return the context
   */
  public Context getContext(String id) {
    for (Context context : contexts) {
      if (id.equals(context.getId())) {
        return context;
      }
    }

    return null;
  }

  /**
   * Builds an XML representation of this configuration. This can be used to persist a programmatically generated
   * configuration.
   * 
   * @return the XML representation of this configuration
   */
  public Document toDocument() {
    // note that this method will not reconstruct a properties
    // element - that element is only used in XML parsing

    Document document = new Document(XmlConstants.MYBATIS_GENERATOR_CONFIG_PUBLIC_ID,
        XmlConstants.MYBATIS_GENERATOR_CONFIG_SYSTEM_ID);
    XmlElement rootElement = new XmlElement("generatorConfiguration"); //$NON-NLS-1$
    document.setRootElement(rootElement);

    for (String classPathEntry : classPathEntries) {
      XmlElement cpeElement = new XmlElement("classPathEntry"); //$NON-NLS-1$
      cpeElement.addAttribute(new Attribute("location", classPathEntry)); //$NON-NLS-1$
      rootElement.addElement(cpeElement);
    }

    for (Context context : contexts) {
      rootElement.addElement(context.toXmlElement());
    }

    return document;
  }
}
